<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			div {
				display: flex;
				width: 800px;
				height: 400px;
				background-color: antiquewhite;

			}

			div span {
				flex: 1;
				background-color: orange;
				margin: 2px;
			}

			div span:nth-child(2) {
				flex: 2;
				background-color: green;
			}
		</style>
	</head>
	<body>
		<div>
			<span>1</span>
			<span>2</span>
			<span>3</span>
		</div>
	</body>
</html>
